The dolphin is unclear small to medium length in relation to other species of the family. The
dark dolphins off the coast of Peru, where they are up to 210 cm (6
feet) in length and 100 kg of thrust (210 pounds) weight. The dolphin
back is dark gray or black, and the dorsal fin is clearly bicolor
corresponding margin of the back in color, but the rear edge is much
lighter gray white. Dolphins have long dark gray spot on the
front, a short beak and dark things.
The dolphin has a dark semi-discontinuous circumpolar region. Dolphins can be found off the coast of South America, southwestern Africa, South Australia and Tasmania, New Zealand and some oceanic islands. From South America, dark dolphins beach in the south of Peru to Cape Horn in the western and southern Patagonia at about 36 ° S in the east. Dolphins are dark in New Zealand waters. In Africa, the dark areas of dolphins in the Bay of Lobito, Angola, north of False Bay, South Africa in the south.
Dolphins prefer dark and cold water upwelling of cold streams. Dark Dolphins over large distances (780 km), but are not well defined seasonal migrations. In Argentina, dark dolphins closely associated with Southern Right whales and sea lions from South America. They were found about dolphins, but apparently not communicate with them and feed Risso's dolphin. In New Zealand, to mix dark dolphins common dolphins. Dark dolphins were also observed with the dolphins in the Southern Right Whales and pilot whales from southwestern Africa. Dark dolphins live in fission-fusion of the Company with the size of most groups will decline during foraging and the size of the groups. During rest and travel in the Golfo San José from Peninsula Valdes, dolphins regularly alternating small and large groups, groups and socio-sexual encounter a variety of partners.
Studies of dolphins of Kaikoura, New Zealand, normally dolphins live in large groups, which are divided into smaller subgroups. These subgroups of adults coupling (contact groups) composed mothers with small groups (kindergarten) and non-breeding adults. Dark Dolphins a promiscuous mating in which men and women who mate with multiple partners. In contact groups males behind the females at high speed to pursue. Unlike the male dolphins dolphins dark males can monopolize females. The time can be as women dark dolphins first reproduce vary by region. New Zealand first reproduce the dolphins at about 7-8 years 6-7 years possibly with dolphins in Argentina.
As with all types of couples where women with multiple partners,
men have testicles and dark Dolphins Dolphins sperm competitionDusky
sometimes engage in sexual behavior for reasons other than reproduction,
perhaps duties greeting or to increase social communication. Homosexual
behavior between males was observed. Dolphins have sex for
social reasons tend to be more relaxed. Females with young often in
groups in shallow water nurseries to collect. The formation of groups of
kindergarten shallow waters also allow the members, prey that hunt live
in these waters.